Perfect for smaller aquariums, this submersible heater requires no adjustments. The electronic thermostat automatically maintains the water temperature at 78°F (±2°). Reduces the risk of overheating, prolonging the life of the heater. Indicator light is red when the water is heating, green when water is at the proper temperature. Made of heat and shock resistant borosilicate glass. 6 foot cord. UL-Listed.

Please click on "More Information" for recommendations and instructions.

Useful Recommendations:

If the heater needs to be removed from the aquarium, unplug the power cord and wait 15 minutes to allow heater to cool before removing it.

Note: This heater is for indoor aquarium use only.

It is a good idea to use a light hood or glass cover to prevent excessive heat loss from any aquarium. Using a hood or cover with aquariums over 10 gallons will provide the best conditions for heating the aquarium.

Instructions:

The heater can be placed either vertically or horizontally in the aquarium. Placing the heater horizontally near the bottom of the aquarium eliminates the need to remove it during normal water changes (25-50% of water). Always unplug the heater 15 minutes prior to exposing it to air. Note: The heater should always be completely submerged in water when plugged into an electric receptacle.

Attach suction cup by pressing firmly onto the aquarium wall. For best results, the aquarium wall should be free from algae. Place the heater in an area with good water circulation.

Arrange a "drip loop" to prevent water from traveling along the cord and coming into contact with the receptacle. The "drip loop" is that part of the cord below the level of the receptacle or the connector, if an extension cord is used, to prevent water traveling along the cord and coming in contact with the receptacle. Note: If the plug or receptacle does get wet, don't unplug the cord. Disconnect the fuse or circuit breaker that supplies power to the appliance. Then unplug and examine for presence of water in the receptacle.

(DO NOT OPERATE THE HEATER DRY; it must be placed in a water-filled aquarium before plugging the power cord into a power outlet.) Once the aquarium is filled with water, wait 15 minutes, then plug heater into electric receptacle. When the unit is heating, a red indicator light will glow. The light will change to green when the optimum temperature has been reached.

The most common temperature for fish is 78°F. Your Submersible Heater automatically adjusts to maintain the proper temperature for your fish (78° to 80°F). In a newly setup aquarium, allow 24 hours for the water to reach the correct temperature before adding fish.

A sharp drop in water temperature is extremely stressful to fish and can compromise their immune system. Improperly sized heaters may not be able to maintain their set temperature and cause aquarium temperature to fluctuate several degrees per day.

Temperature can be the single most important component in the life of your fish. Fish, in the wild and in our aquariums, are very sensitive to changes in temperature. Learn the affects of water temperature on fish health.

Please note: Return of electrical equipment to Drs. Foster & Smith for exchange or refund is limited to 60 days from the date of purchase. Beyond 60 days, please contact the manufacturer for repair or replacement as covered by the manufacturer's warranty.

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Just what the Doctors ordered/shipped
Excellent choice for my 10 gallon QT/fry tanks. Let it acclimate to the water temp, plug it in, and walk away. Simple, economical, reliable!!!
February 7, 2015

works well within its limits.
these heaters are awesome so long as you use it within its limits? 100W for a 30 gallon is a stretch. 20 gallon absolutely. but i live in the cold northeast so i always go with a larger heater. i use these in sumps as backups to main heaters, and for the price i also use for emergency heaters. i always have 2 on hand. will hold temperature(when coupled 2 together) in my 180 gallon tanks till i can get to store for replacements. .have them in my kitchen betta tank on up to a 40 gallon feeder tank. economical, automatic, submersible, small... in a word AWESOME...
December 22, 2014

Great Product
I have purchased several of these heaters for various tanks, and I highly recommend them. The fact that they are submersible is great. The constant temperature is completely hands-free and accurate. The red and green indicator lights reassure that the unit is working. A solidly reliable heating unit. You won't be disappointed.
June 18, 2014

great price. excellent product
This product was almost half the price of what my pet store was charging
February 27, 2014

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Perfectly normal. There is no green light. The red light means it is currently heating the water. When the light goes off, it means the water has reach the desired temperature, and it shuts off. Once it feels that the temperature is lowering, it will turn back on again. Not defective.

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I would say it is defective, but only if it's in not heating the aquarium. I have found depending on the angle you view the heater sometimes it looks like the green light is not on. If it's heating as expected I wouldn't worry about it.

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Thank you for your question. Please free feel to contact our Customer Service Department at 1-800-443-1160, or CustomerService@FosterandSmithAquatics.com and we will be happy to assist you with your question.

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Description:
Aqueon ProHeater ensures safe, easy and precise temperature
control of your aquarium. Its power monitor light lets you know when the unit is heating (red) and when it has reached the set temperature (green). You'll never have to guess ...